Controller for humidifiers.



F. W. PARKS. CONTROLLER PoR Hu'rwmmms.

APPLICATION FILED 061127' 1913.

Patented July 17,1917.

2 SHEETS-SHEET l.

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lm/enfer. Fredrk W. P arKs F. W. PARKS.

CONTROLLER FOR HUMIDIFIERS.

APPLICATION FILED OCT- 27. |913.

Patented .1 uly 17, 1917.

2 SHEETS-SHEET 2.

Winesses.

lnven'ior. Freder'cl( VV. PurKs A LyS.

FREDERICK W. PARKS, 0F FITCHBURG, MASSACHUSETTS, ASSIGNOR T0 THE Gl'. M.

PARKS COMPANY,`0F FITCHBURG, MASSACHUSETTS, A GORPORATION 01E' MASSA-CHUSETTS.

CONTROLLER FOR HUMIDTFIERS.

Specincation'of Letters Patent. Patented July il?, llllli Applicationled october 27, 1913. Serial No. 797,435.

To all whom t may concern.'

Be it known that I, FREDERICK W. PARKS, a citizen of the United States,and residing at Fitchburg, county of Worcester, and State ofMassachusetts, have invented an Improvement in Controllers forHumidiers, of which the following description, in connection with theaccompanying drawing, is a specification, like characters on the drawingrepresenting like parts.

This invention relates to improvements in controllers for .humidiers orhumidifying systems which are adapted to maintain in the air of a room aconstant amount of moisture or humidity at a certain selectedtemperature.

It relates particularly to means for controlling the amount of moisturesupplied to the atmosphere in humidiiers of the type in which water isatomized and distributed directly to a room from the supply pipes,although it may be used to control other humidifiers, such as those inwhich the Water is supplied from a reservoir to the moistening devicesand the drip or waste from the lat- -ter returned to the reservoir.

tempering devices being in some instances placed in the path of thecurrent of air to e maintain it at the desired temperature. ln

such devices the quantity of water used is far in excess of thatnecesary to supply the required amount of humidity to the air and thisexcess of Water is ordinarily returned to the supply tank and repeatedlyused. As a consequence the water soon becomes polluted by dust, lint,and germs absorbed from the air of thc room during its repeated passagethrough the humidifier so that after the humidier has been operating fora time the air in the neighborhood of the humidifier contains a largerpercentage of harmful germs than the normal air of the room as appearsfrom the Report 0f the Massachusetts State Board of Health publishedJuly, 1913, p. 298. By supplying moisture directly to the atmospherefrom the supply pipe and so regulating the supply as to deliver only theamount of water necessary to maintaln the air of the room at the desiredrelative humidity the accumulation of harmful germs inthe vicinity ofthe humidier is avoided and no substantial amount of Water 1s wasted.'lhe latter is a matter of considcrable lmportance, especially in millslo` cated in climates having a dry season in which the streams of Wateroften fail and also in factories in which the Water is metered andpayment made for the actual amount consumed.

It is desirable, and in fact necessary, that the regulating device usedin a system in which the moisture is supplied directly to l the roomshall be sensitive to a small change in the relative humidity of theroom, that it shall be accurate and reliable, and shall be of such acharacter that it will not be likely to become clogged with dust, lint,etc. or if it does in time become dirty that it may be readily cleaned.

It is desirable that the number of ipes and other apparatus formingparts o? the humidifier equipment be reduced as much as possible. In theconstruction disclosed here- 'in this is accomplished by supplying themoisture to the air through turbo heads, which Will hereinafter be morefully described and by utilizing the fluid pressure medium whichoperates said turbo heads to actuate the controller for said heads andalso to actuate the means which maintains the wet element of thecontroller at its psy chrometric Wet bulb temperature.

ln the apparatus herein described the con- -trolling mechanism isoperated to regulate the force of the operating medium, although it isto be understood that the invention is not limited to the regulation ofthe operating medium but may also be utilized to regulate the supply ofmoisture or may regulate the amount of air which is introduced to theroom from outside,or the temperature of the room. v

I am aware that heretofore humidity controllers have been produced inwhich the humidity of the atmosphere was regulated through mechanismoperated by the dierf ence in expansion vand contraction ofa wet and drymember, but ll am not aware of the ter was maintained at itspsychrometric wetI bulb temperature by being placed within the I path ofa current of saturated air moving at contact with a volume of saturatedair, land l absolute psychrometric wet bulb temperarat a velocitcorresponding to the velocity with whichrte Sling thermometer isrequired to travel to give the psychrometric wet bulb temperature of theatmosphere. The rate of movement of such Sling thermometer is 15 feetper second.

One ob'ect` of the invention is to provide a regulating devicecomprising two expansible elements, a wet member and a dry member inwhich the wet member is constantly maintained at its psychrometric wetbulb temperature by reason of its direct in which the relative humidityof the atmosphere may be controlled for any given temperature withinreasonable limits by the dierence in expansion and contraction of thewet and dry elements.

Another object of the invention is to provide a humidity controllerwhich is operated by the same motive forceas that which operates thehumidifier itself, thereby eliminating unnecessary pipes, wiring,and'other forms of a paratus from the room in which the humidifier orhumidifiers are located.

Another object of the invention is to,Y utilize the same motive force asthat which operates the humidifiers to induce and supply a current ofsaturated air to the wet element to maintain it at substantially theture of the air. 4 Another object of the invention is to vprovide meansfor insulating the wet element from the influence of thesurroundingatmosphere so that substantially an absolute wet bulb tein erature maybe maintained.

Another o the objects of this invention is to rovide a simple andeffective controlling evice which will not be likely to become cloggedup with dustv or ibers floating' in the air, and which can be easilycleaned by an inexperienced man without damage to the instrument.

Other objects of my inventionA will more fully appear from'] theaccompanying description and drawings and will be particularlj;r pointedout in the following claims.

In the drawings:

Figure 1 is a front elevation partly in section of an apparatusembodying my in vention.

Fig. 2 is an end view of the expansible element showing the controllinglever operated therebyl and the manner in which it is secured to saidelement.

Fig. 3 is a detail view of the iilterused in connection with myvinvention and illustrates the manner in which the head of the p lterisdetachably securedto Jpermit replacement of the a material.

iasaow Fig. 4 is a vertical sectional view of another of the referredembodiments of my invention, and) Fig. 5 isan end view of the same.

The embodiments of my invention illustrated herein are shown as appliedto a humidifier system in which the moisture is. delivered to anddistributed ina room, such as a room of a cotton mill or a silk mill bya water pipe. having a jet pipe or jet pipes terminating in vaporizingdevices operated by a current of compressed air directed into the heador nozzle of the spray pipe, and which serves to induce a flow of waterproportionately to the amount of the pressure of the escapin compressedair.

The particu ar type of nozzle which is used in connection with myinvention is a .turbo head of the type which forms the subject matter ofPatent No. 869,945 granted Nov. 5, 1907 to Albert W. Thompson and ofl1910, and also of my application for Patent No. 787, 382 filed Aug. 29,1913. In this type of humidifier the vaporizer comprises a head Thavinga circular chamber provided with a tangential nozzle for theadmission of compressed air or steam uiider pressure, with an axialoutlet at one end of the chamber and at its other end a water dischargenozzle extending coaxially into said chamber. In such a device thenozzle is connected with a source of water supply, the water being atsubstantially atmospheric Apressure and the action of the compressedair, or steam under pressure, serves to break up and vaporize theparticlesv of -water in the circular chamber of the head, resulting in ajet of vapor issuing from the axial outlet of the chamber withsufiicient force to produce a current of air which will distribute themoisture throughout the room.

In Fig. lof the drawings the compresse air pipe leading to such ahumidifier is indicated by the pipe 1 through which compressed air orsteam Hows in the direction designated by the arrows. In front of thehumidifier head T of a series of heads a motor operated valve 2 isprovided, in which the valve is adapted to be forced open, from itsseat, by a spring 3 surrounding the stem 4 of the valve and abuttingupon a plate 5 secured to the valve stem at its end. In the operation ofthe machine,

the compressed air or steam which is supplied to the humidifiers will beshut H whereas if the amount of pressure in the by-pass is reduced thespring will force the valve from its seat, and more compressed air orsteam will be supplied throughthe pipe 1 to the turbo heads.

The mechanism for operating the valve 2 as illustrated in Fig. 1comprises a pipe or by-pass l leadin from a point in -the main air pipein a vance of the'valve 2 through a filter 11, which serves to removeany solid impurities, thence through a conduit to a chamber beneath thediaphragm which actuates the valve 2. The conduit comprises "a pipe 12and commfurnicating passages 13 and 17 in a casting 14 which forms asupport for the regulating apparatus. The passage 13 is provided with aplug 15 having a relatively small opening 16 adapted to restrict theamount of the compressed air which is introduced beneath the diaphragmto that necessary to properly operate the valve. The'passage 13terminates in a transverse aperture or passage 17 which leads to thechamber 18 beneath the diaphragm 6.

The amount of pressure maintained in the chamber 18 beneath thediaphragm 6 to actuate the diaphragm is regulated by a valve 19preferably located in the mouth of the passage 17. This valve asillustrated in Fig. 1 is adjustably arranged and comprises a hollowmember 20 which is screw-threaded into the end of the passage 17 saidmember having a. ball 21 supported within the hollow chamber thereof andadapted to normally close an axial opening 22 therein. The ball isadapted to be raised from its seat by a pin 23 extending through saidaxial open- -ing and resting upon the end of a lever 24 which isconnected to the outer ends of the eXpansible wet and dry elements aswill be hereinafter described.

It will be obvious that by adjusting the screw threaded member 20upwardly or 4downwardly the amount of movement of the lever necessary toopen and close the valve will be varied andsuitable regulation therebyprovided for controlling the degree of humidity at differenttemperatures.

The air supplied through the by-pass to the chamber beneath thediaphragm 6 is freed from dust and other impurities by passing throughthe filter 11, which as illustrated in the drawings, comprises acylindrical chamber, in which a suitable amountv of absorbent cotton 30or other filtering material is held in place by a detachable plug 31provided at its end with a screen 32 which is adapted to press againstthe absorbent material but which permits the air to escape withoutinterference into the pipe 12. The plug 31 is retained in place by meansof a U- shaped I yoke 33 having inturned feet or will;

claws 34 which pass over a collar 36 screwed o? otherwise suitablysecured upon the end o the cylindrical lter chamber 11, the yoke 33being provided with a thumb screw 37 adapted to press upon the outer endof the plug 31 -to secure the same rmlyin place. 1f desired a washer orsuitable packing 38 may be placed between the plug 31 and the end of thecylinder 11 to provide an air tight joint. 0

The means for operating the lever 24 and thereby controlling thepressure of the compressed air in the chamber 18 beneath the diaphragm 6comprises a pair of expansible members 40 and 41 each of which isrigidly secured at one end to the casting 14 and preferably projects`horizontally therefrom. rllhe outer free ends of the members 40-41 areeach connected rigidly to branches 42 and 43 of a Vletmr 24 so that thelever 24 will to prevent the surrounding atmosphere from linterferingwith the accurate operation of the humidifier controller.

The outer end of the brass tube 40, which will hereafter be designatedas the dry element, is provided with a collar 45 which has a flattenedprojection 46, to which the end of the branch 42 of lever 24 is securedby a rivet 47 or other suitable fastening, said branch 42 preferablybeing upturned at its end 48 to embrace said Vcollar and afford a morerigid connection between the collar 45 andthe branch 42. IThe rod 41,which will be hereafter designated as the wet element is likewise screwthreaded at its end and is provided with a collar 49 to which the branch43 of the lever 24 is rigidly secured by a rivet 50 or other suitablefastening. Inasmuch as the branch 43 of the lever 24 issubjected tocompression rather than tension a shoulder 51 is provided upon thecollar 4() against which the' end of the may be provided. However, inthe particular construction illustrated in Fig. 1 the water'is suppliedthrough a pipe 60 which leads to aturbo head 61, such as that abovedescribed, and which is in effect an auxiliary humidifier, thecompressed air being suplied to said head through a pipe 62 leading rom.the passage 13 in advance of the restricting plug 16. By thisarrangement the same motive power is used to induce and y supply acurrent of saturated air to the wet bulb member as is'used to supplyhumidifed air to the room through the humidifier or humidifiers operatedby the compressed air from the main pi e 1, and also this same motivepower is-utllized for shutting olf the humidiiers.

In the operation of the device disclosed herein a constant current ofsaturated air is induced and caused to ass over and around thewet-element 41 and y reason of the fact that this current of air ismaintained at sub'- stantially constant speed of 15 ft. per secondthewet element is maintained at its psychrometric wet bulb temperature.The dry ex.- pansible element 40 is exposed tothe atmosphere of the roomandexpands or contracts with the variations in temperature therein. Thedifferential 4expansion of these two members serves to oscillate thelever 24 through itsbranches L12--43, which -are connected to the endsof said expansible members, and the oscillation of said lever raises orlowers the ball 21 to open and close the opening or port 22 thuscontrollin the pressure in chamber 18 beneath the 'aphragm 16, andconsequently opening or closing the e compressed air is supplied to the.

v valve 2 and thereby vturning 'on or oif the compressed air fluid whichis su plied to the humidifier and humidifiers of t eroom. It

is found in practice that this a paratus -works with exceeding accuracy,a c ange of temperature due to a change in relative humidity from to ofa degree in the air of the room being sufficient to cause theactuatingof the`- controlling valve.

In F' 4 and 5 I have shown asimplifed and pre erred form of controller.This controllerlike that illustrated in Figs. land 2 is rovided with amotor valve operated by av 'aphragm, which is not illustrated, butthe-cover 100 for which is shown in Fig. 4 vwith a chamber 101corresponding to the chiamber 18 of the device illustrated in chamber101 through a by-pass from the main compressed air pipe, said by-passleadber is preferably formed in an extension of the casting 105 whichserves to support the various parts of the reglulating evice.

,A passage 106 for t e compressed air -leads from the lter to atransverseA paage 107 leading to the chamber 101 beneath the diaphravalve, said passage 106 being provide with a restricting plug 108 havinga small orifice such as that above described vin reference to theconstruction shown in Fig. 1. The relief valve in this constructionconsists of a screw threaded member 109 which passes through the casting105 intersecting both passages 106 and 107. The member 109 preferablycom rises a screw threaded stem bored longitu inally but terminating ina smaller or restricted opening 110 serving as a relief port which maybe opened or closed b the end of a lever 111 operated by the re ativeexpansion or contraction of the wet and dry members as will hereinafterbe more fully described. The other end 0f the bore is preferably closedby a removableA screw threaded plug. By such a construction the port 110may be opened and closed by the direct action of the lever or if areverse operation is desired the member 109 may be raised out of contactwith the lever and a ball and stem inserted through said bore to form avalve like that illustrated in Fig. 1. The head of the member 109 ispreferably made in the form of a disk and is graduated to indicate theproper 'adjustment of said member to supply the desired amount ofhumidity at a given temperature of the atmosphere.

The means for operating the lever 111 comprise the element 112 which ispreferably tubular 1n form and is secured rigidly at one end to thecasting 105 and at its outer or free end to the lever 111, and the wetmember 113 which is likewise in the form of a tube and is-secured at oneend to the casting 105 and at its free end to the lever 111. The wetmember 113 may, if desired, be provided with a protecting casing 114 toinsulate the wet element from the influence of the surrounding air ofthe room. The wet and dry membersgsed in connec- 'tion with mypreferred' form of invention -at right angles to the direction in whichmaaar said members extend. rlhe lever 111 is rigidly attached to a crosspiece 120 which in turn is secured to the transverse portions 118 of thestraps 117.

llt Will thus be obvious that a dierence in the expansion of the members112-113 Will cause an oscillation of the lever 111 andthat its end willcontact with or be removed from the seat 110 at the end of theadjustable member 109 thus acting as a valve to control the amount ofpressure in the cham-v ber 101 beneath the diaphragm valve in the samemanner as was described in the apparatus illustrated in lFigs. 1 and 2..

Saturated air may be supplied to the wet member in this my preferredform of apparatus through a turbo head 130 having la Water `pipe 131extending axially into the same, and is supplied with compressed air 'orsteam through a pipe 132 leading frgom the'passage 106. This turbo headinduces plied moves .at substantially therate of 15v ft. per second, theWet element is maintained at the psychrometric Wet bulb temperature ofthe air. Other means, however',- may be used for obtaining this Wet bulbtemperature. 1t is to be observed that in each of the embodiments of myinvention disclosed herein the entire apparatus may be located -yin theroom which is to bev humidied so that the atmosphere which allects thedry and Wet bulb respectively is the atmosphere of such room which byreason of its normal temperature causes the expansion and contraction ofthe dry member 112, and by reason of its saturation maintains the Wetmember at the psychrometric wet bulb temperature.

It Will alsobe noted that .the cylindrical Wet and dry elements areeasily accessible and may be cleaned readily by a cloth or swab or by ajet of compressed air, inasmuch as the dry member is open at one end andthe Wet member at both ends.

lf it is found necessary because of an unusual amount of dust or lint ina room a screen may be provided either to surround. the entireregulating device or such portions thereof as it is found necessary tokeep from deposits of dust, etc.

1t is to be understood that While 1 have described this invention asparticularly applicable to a direct moisture supplying system, it may beused also in connection With other systems of humidiiers and may bearranged to control either the operating medium, the Water supply or'theair supply to the room or to regulate the temperature of the room by theuse ofV any suitable mechanism for controlling the heating plant or aradiating system.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. ln combination with a humidifying apparatus comprising Watersupplying means and means for supplying a motive fluid for vaporizingsaid Water, controlling mechanism including v'vet and dry bulb elementsand means connected to said motive duid supply and actuated thereby formaintaining said vvet bulb element at the psychrometric Wet bulbtemperature of the atmosphere.

2. 1n combination with a humidifying apparatus comprising Watersupplying means and means for supplying a motive fluid for vaporizingsaid Waterand distributing the vapor, controlling mechanism for themotive fluid including Wet and dry bulb elements and means connected tosaid motive' lluid supply and actuated thereby for continuouslysupplying to said Wet bulb element a current of saturated air movingwith sullicient rapidity tomaintain said Wet bulb element at thepsychrometric Wet bulb temperature of the atmosphere.

3. 1n combination with a humidifying apparatus comprising a vaporizingdevice, means for supplying Water ,thereto and means for supplying afluid under pressure to actuate said vaporizer, a controller includingWet and dry bulb expansible elements, means connected to said motivefluid supplyl and, actuated thereby to supply a y current of moisturesaturated air to said Wet bulb element and means also actuated by saidpressure fluid and regulated by the differential expansion of the Wetand dry bulb elements to control the motive fluid supplied to saidvaporizer.

4. lin combination with a humidifying apparatus comprising a vaporizingdevice,

" means for supplying Water thereto, a compressed air conduit leading tosaid vaporizing device for vaporizing the Water and distributing thevapor, regulating means for controlling the supply of -compresed air tosaid vaporizing device comprisingexpansible elements subject to the Wetand dry bulb temperatures of the air, a valve in said compressed airconduit having a diaphragm ing branches connected respectively to saidwet and dry bulb expansible elements whereby the movement of saidbranches caused by the diii'erential expansion of said wet and dry bulbelements resulting from changes in relative humidity of the atmosphere,will cause said leve'r to open and close said valve.

7. In combination with a humidifying apparatus comprising a vaporizingdevice,

means for supplyingthe samefwith water, means including a conduit for suplying a motive iiuid to said vapqrizing evice for vapori'zing saidwater andl distributing the va r,'a valve in said conduit, wet and dry bbex ansible elements, means actuated by their diierential expansion tooperate said valve and means for indue' a current of air from theimmediatey vicinity ofthe controller, saturati'iio and delivering thesame to the surface ci5 said wet bulb element to maintain the same atits psychrometric wet bulb temperature. y

. 8. In combination with a-humidiying apparatus comprising a vaporizingdevice,

means for supplying the same -with water, means including a conduit forsu a or motive fiuid to said vaporizing evice vaporizing said water anddistributing the vapor, a valve in said conduit, wet and dry bulbmembers having the same co-eiiicients of expansion, a lever connected toboth of said elements and adapted to be oscillated by the' jointAlaction thereof wheir'` expanded unequally to actuate said valve,meansto in' the psychrometric wet bulb temperature 'of' v motive iiuidto saidvaporizing duce a current o`f air taken from the atmosphereimmediately@ 'surrounding 'the' 4cointroller, to saturate and deliverthe same intol contact with said wet bulb element ata ve' locitysuicient to maintain said'element at the atmosphere.

9. In combination with a humidifying apparatus comprising a vaporizingdevice, means for supplying the saine with water, means including aconduit for suiplyiug aA evice vaporizing said `water and distributingthe vapor, a valvefin said conduit,- wet and dry` bu b1 members havingthe same co-ecients of expansion, a leveigconnected to both of saidelements `and adapted to be oscillated by the joint action thereof whenexpanded temperatures for* unequally to actuate said valve, means toinduce a current of ail` taken from the atmosphere immediatelysurrounding the controller, to 'saturate and deliver the same intoContact with said wet bulb element at a velocity suiiicient to maintainsaid element at the psychrometric wet bulb temperature, of theatmosphere, and insulating means surrounding said element to protect thesaine from the iniiuence of the atmosphere which envelo s thecontroller.

10. X humidifier controller comprising a valve and means for actuatingthe same including wet and dry bulb expansible elements, a leverdirectly and rigidly connected to both of said elements and adapted tobe `oscillated by their differential expansion,

means for maintaining a current of satu- V rated air in contactwith thesurface ofthe wet bulb element and for causing said cur'- rent ,to 'iowat a velocity which will maintain the element at the psychrometric wetbulb tem erature of the atmosphere. 11. A. umidifier controllercomprising a Vvalve and means for actuating the same ins cluding adiaphragm, a com ressed air chamber beneath thesame, a re ief passageleadin from said compressed air chamber, a relie valve for said passage,wet and dry bulb. expansible .members each immovably secured at one end,a lever rigidly secured to both said elements at the op osite endy andadapted to be oscillated by t e differential expansion of said elementsto o en and close said relief valve and means or adjusting said relier`valve whereby a predetermined humidity of the atmosphere at diiierentmay be maintained.\

12. A humidifier controller comprising a valve, wet and dry bulbexpansible elements `and`means actuated by the differential expansion'of said elements to open and close said valve, means for supplyingmoisture to'the inner' surface 'of-said wet bulb element consisting of avaporizing device located adjacent to one end of said element andadapted to linduce a current of air from the immediate vicinity of theAcontroller to -saturate the same and deliver the saturated -air 'to theinner surface of said wet bulb member at substantially the psychrometricwet bulb temperature of the atmosphere.

13. A humidiiier .controller comprising tubular wet and dry bulbexpansible elements' arran ed in parallelism and adjacent each other, te Wet'bulb expansible element beingl open at both ends, a vaporizerlocated l ad] acent to one end of said wet bulb element and'means foractuating said vaporizer to induce a current of air from the atmosphereimmediately surroundingfthe controller to saturate the vsame and toforce it Athrough the interior of the w'et bulb element at a suficientrate of speed to maintain the inner surface of said element atsubstantially the psychrometric vvet bulb temperature of 'the atmosphereand means actuated by the differential expansion of said Wet and drybulb elements to regulate the action of the humidiier.

14. In a humidifying system comprising a vaporizing device, a Watersupply therefor, a conduit for supplying a fluid under pressure to saidvaporizing device to vaporize said Water and distribute the same, avalve in said conduit, a motor for said valve including a casing havinga chamber, a diaphragm covering said chamber and operatively connectedto said valve, a by-pass leading from said fluid supply conduit to saidchamber beneath said diaphragm, a relief passa e for said chamber, avalve in said relief passage, Wet and dry bulb elements connected tosaid casing arranged in parallelism, means for maintaining said Wet bulbelement `at the psychrometric Wet bulb temperature of the surroundingatmosphere and means operated by the differential eX- pansion of saidelements to open and close said relief valve and thereby to control thevalve in the fluid supply conduit.

15. ln a humidifier system comprising a vaporizing device, a Watersupply therefor, a conduit for supplying a Huid under pressure to saidvaporizing device to vaporize said Water and distribute the same, avalve in said conduit, a motor for said valve including a casing havinga chamber, a diaphragm covering said chamber and operatively connectedto said valve, a by-pass leading from saidfluid supply conduit to saidchamber beneath A said diaphragm, means for filtering the air suppliedthrough said by-pass, a relief passage for said chamber, a valve in saidrelief passage, Wet and dry bulb elements connected to said casingarranged in parallelism, means for maintaining said wet bulb element atthe psychrometric Wet bulb temperature of the surrounding atmosphere andmeans operated by the differential expansion of said elements to openand close said relief valve and thereby`to control the valve in thefluid supply conduit.

16. lin a humidifying system comprisin a vaporizing device, a watersupply there or,

a conduit for supplying a fluid under pressure to said vaporlzlng deviceto vaporize said Water and distribute the same, a valve in said conduit,a motor for said valve including a casing having a chamber, a diaphragmcovering said chamber and operatively connected to said valve, a bypassleading from said fluid supply conduit to said chamber beneath saiddiaphragm, means for filtering the air supplied through said by-pass, arelief passage for said chamber, a valve in said relief passage, Wet anddry bulb elements connected to said casing arranged in parallelism, avaporizer having a Water supply d an air conduit u a eating with saidby-pass, said vaporizer being located adjacent to the end of said vvetybulb element and adapted to induce a current of air to saturate the sameand deliver the saturated air to said Wet bulb element and meansoperating by the dierential eX- pansion of said elements to open andclose the valve in said relief passa e and thereby4 fluid supply meansfor filtering the air supplied through.-

said by-pass, a relief passage for said chamber, an adjustable valveseat in said relief passage, a valve in said valve seat, Wet and drybulb elements connected to said casing arranged in parallelism, avaporizer having a Water supply and an air conduit communicating withsaid by-pass, said vaporizer being located adjacent to the end of saidWet bulbv element and adapted to induce a current of air to saturate thesame and deliver the saturated air to said Wet bulb element and meansoperating by the diderential eX- pansion of said elements to open andclose the valve in said relief passage and thereby to control the valvein said fluid supply conduit.

18. In a humidifying system comprising a vaporizing device, a Watersupply therefor, a conduit for supplying a fluid under pressure to saidvaporizing device 4to vaporize said Water and distribute the same, avalve in said conduit, a motor for said valve including a casing havinga chamber, a diaphragm covering said chamber and operatively connectedto said valve, a by-pass leading from said fluid supply conduit to saidchamber beneath said diaphragm, a relief passage for said chamber, avalve in said relief passage, Wet and dry bulb elements connected tosaid casing arranged in parallelism, a vaporizer having a Water supplyand an air conduit communicating with said by-pass, said vaporizer beinglocated adjacent to the end of said Wet bulb element and adapted toinduce a current of air to saturate the same and deliver the saturatedair to said vvet bulb element, means located between said Wet and drybulb ele ments and connected to the free ends thereof and operable bythe diderential expansion of said elements to actuate said relief valveand thereby to control the valve m said duid supply conduit.

' 19. `A motor operable by variations of the condition of humidity ofthe atmosphere comprising a stand having a recess, a diaphragm coveringthe same to form a chamber, power transmitting means adapted to beoperated by the movement of said diaphragm, a conduit'leading to saidchamber, means for supplying a fluid under pressure to said conduit, arelief passage communicating with said chamber, a/valve in said reliefpassage, wet and dry/bulb expansible members rigidly secured at one endto said stand and arranged in parallelism, means for supplying saturatedair to said wet bulb element and means connected to the free end of saidwet and dry bulb elements and operable by the differential expansionthereof to actuate said relief valve.

20. A motor operable by variations of the condition of humidity of theatmosphere comprising a stand having a recess, a diaphragm covering thesame to form a chamber, power transmitting means adapted to be operatedby the movement of said diaphragm, a conduit leading to said chamber,means for .supplyingI a Huid under pressure to said conduit, a reliefpassagel communieating with said chamber, a valve in said reliefpassage,wet and dry bulb expansible,

members rigidly secured at one sal stand and arranged -in` parallelism,means for supplying saturated air to said wet bulb element, meansconnected to the free end of said wet and dry bulb elements and 0p-.erable by the diEerential expansion thereof to actuate said reliefvalve,and means for adjusting said' valve whereby theaction of the motor maybe varied for different desired conditions of humidity.

21. A `motor operable by variations of the dierence ofthe atmospherecomprising a stand having a recess, a diaphragm covering the same toform a chamber, apower transmitting means adapted to be operated by themovement of said diaphragm, a conduit leading to said chamber, means forsupplying the fluid under pressure to said chamber through said conduit,a lrelief passage communicating with said chamber, wet and dry bulb'members rigidly secured to said stand and arranged ,in parallelism, alever connected to the free ends of said wet and dry bulb elements anddisposed intermediate of said elements and into operative relation tesaid valve, means for maintain said wet bulb element at substantiallythe psychrometric wet bulb temperature of the atmosphere.

22. motor operable by variations of the condition of the atmospherecomprising a stand having a recess, a diaphragm covering the same toform a chamber, a conduit leading to` said chamber, means for supplymga1r under pressure to said conduit,

dust and moisture from the air assin therethrough, a restricting block1n sai conduit, a relief passage leading from said chamber, a valve insaid passage, wet and dry' bulb elements 'rigidly secured at one end tosaid stand and a lever rigidly secured to the free ends of said elementsand coperatively engagin said valve.

23. A motor operab e by variations of the conditions ofthe atmospherecomprising a stand having a recess, a diaphragm covering the same toform a chamber, a conduit leading to said chamber, means within saidconduit for absorbing dust and moisture from the air supplied throughsaid conduit, means adapted to permit the removal of said absorbingmeans, a relief passage communicating with said conduit, a valve in j.said relief passage, Wet and dry bulb eled'" ments rigidly secured atone end to said stand, means fof.` maintaining the wet lbulb element atthe psychrometric wet bulb temperature of the atmosphere and meansoperable bythe differential expansion of said wet and dry bulb membersvfor operating said valve.

24. In a humidifying apparatus, a water supply, means for vaporizing theWater comprising a conduit for supplyingdiuid under pressure, a valve insaid conduit, a

iluid4 pressure motor operatively connected to said valve, means forsupplying ilnid under pressure to said motor, regulating means for saidmotor including expanslble elements subject respectively to the wet anddry bulb temperatures of the atmosphere and means operable by theirdifferential expansion to control the supply of fluid under pressure tosaid motor.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribing witnesses.

FREDERICK W. PARKS.

Witn:

Ro S. PARKS, Parscrma L. Wmssaacn.

Ameans within said conduit for absorbing the

